JP2605418Y2 - Excess fuel return device to fuel tank - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for returning surplus fuel in a fuel tank of an automobile.

[0002]

2. Description of the Related Art In a fuel tank equipped with a pump for an automobile or the like, excess fuel among the fuel sent to the engine by the pump is returned to the fuel tank. 3 and 4 are sectional views showing a conventional fuel tank and fuel system. FIG. 3 shows a one-room type fuel tank for a 2WD vehicle, and FIG. 4 shows a two-room type fuel tank for a 4WD vehicle. In a one-chamber type fuel tank, as shown in FIG. 3, a filter 3 is provided in a fuel tank 1 for storing a fuel 2, and the fuel 2 in the fuel tank 1 passes through a filter 3 and a fuel pump. 4 feeds the injector 6 via the feed line 5. Excess fuel 7 among the sent fuel is returned to the fuel tank 1 via the return line 8. In the case of a two-chamber type fuel tank, FIG.
As shown in FIG. 1, the fuel tank 1 includes a main tank 1a and a sub-tank 1b, and a jet pump 9 is disposed in the main tank 1a together with the fuel pump 4. ,
The jet pump 9 is provided with an injection nozzle 9a at an end of the return pipe 8. The negative pressure generated by the injection of the return fuel 7 from the injection nozzle 9a causes the fuel in the sub tank 1b to pass through the filter 11 and the suction pipe 10. Is sucked and ejected together with the return fuel 7 from the ejection port 9b into the main tank 1a. In an engine such as an automobile, fuel is sent from the fuel tank 1 to the engine as described above, and a surplus is returned from the engine to the fuel tank 1, so that a part of the fuel circulates between the engine and the fuel tank 1. It is doing.

[0003]

SUMMARY OF THE INVENTION In the above-described fuel tank of an automobile, it is necessary to suppress the occurrence of breathing and evaporative gas generated by the deviation of fuel due to a rise in fuel temperature or turning, and to prevent the sound of jetting. It is preferable that the fuel is ejected from the return circuit including the jet pump to a portion near the suction port of the fuel pump and near the tank bottom. However, when the temperature of the fuel is high in summer, the return fuel itself is boiled and mixed with evaporative gas. Therefore, when the fuel is sucked into the fuel pump 4 through the filter 3, the fuel pressure decreases due to gas components in the fuel, and the breathing is stopped. This sometimes caused the phenomenon to occur.

The present invention has been made to solve the above-mentioned problems in the conventional fuel tank of an automobile, and separates the gas component in the return fuel from the liquid component, and the gas component in the return fuel is supplied to the fuel pump. It is an object of the present invention to provide a surplus fuel return device for a fuel tank configured to prevent the fuel pressure from being reduced by being sucked.

[0005]

In order to achieve the above object, according to the present invention, a pump is provided inside a fuel tank through which a fuel is sucked through a filter arranged at the bottom of the tank.
In a return device for returning excess fuel supplied to the engine by the pump to a tank through a return pipe, a return port of the return pipe is opened at a position close to a filter arranged on a suction side of the pump. Yes,
In addition, a flat plate-like protector that opposes the return fuel ejected from the return port to directly abut the filter is provided between the return port and the filter, facing the return port.

[0006]

Since the fuel tank according to the present invention is constructed as described above, the return fuel ejected from the jet port of the jet pump collides with the protector to reduce its momentum, and after colliding with the protector, During the detour, the gaseous component, that is, the evaporative gas, becomes bubbles and diffuses to the upper part of the fuel tank. As a result, only the liquid component of the return fuel passes through the filter and is sucked into the fuel pump, so that a phenomenon such as a decrease in the fuel pressure caused by the gas component of the return fuel being sucked into the fuel pump is eliminated. .

[0007]

FIG. 1 is a sectional view of a fuel tank and a fuel system showing an embodiment of the present invention. In the drawings, reference numerals 1 to 9 denote the same or corresponding parts as those of a conventional device, 20 denotes a protector,
1 is a bracket for mounting the fuel pump. In the surplus fuel return device of the fuel tank 1 according to the present invention,
A protector 20 is mounted between the jet port 9 b of the jet pump 9 and the filter 3. This protector 20
In FIG. 1, a part of a metal plate bracket 21 for mounting the fuel pump 4 to the fuel tank 1 is extended to form a protector 20. The return fuel 7 spouted from the jet port 9b of the jet pump 9 collides with the protector 20, goes around the periphery of the protector 20, and is sucked into the fuel pump 4 via the filter 3 when evaporating gas mixed with the return fuel 7. Are dispersed as bubbles in the upper part of the tank 1. That is, the evaporated gas, which is a gas component in the return fuel 7, is separated from the liquid component, and only the liquid component is sucked into the fuel pump. Therefore, a decrease in fuel pressure due to mixing of the evaporative gas is prevented.

FIG. 2 is a perspective view showing another embodiment of the protector. In this embodiment, the protector 22 made of a metal plate is fastened to the upper surface of the filter 3 by a set screw 23 immediately below the jet port 9 b of the jet pump 9. As in the case of the above embodiment, the return fuel 7 jetted from the jet port 9b of the jet pump 9 flows on the upper surface of the protector 22, reaches the filter 3, and evaporates while being sucked into the pump via the filter 3. The gas becomes bubbles and the fuel tank 1
And the gas component in the return fuel is separated from the liquid component.

In the above embodiment, the protector 20,
22 is made of a metal plate.
The materials 0 and 22 are not limited to metal plates, but may be oil-resistant resins.

[0010]

[Effect of the Invention] The present invention is applied to a fuel tank of an automobile.
A flat protector is disposed between the filter and the jet port of the jet pump that jets the return fuel into the fuel tank, so that the gas component in the return fuel is separated from the liquid component. Because we configured
The following excellent effects were obtained. (1) The fuel pump does not suck the evaporative gas of the return fuel, and the occurrence of the breathing phenomenon is prevented. (2) Return fuel can be ejected near the fuel pump. As a result, there is no increase in fuel temperature, no breathing due to fuel offset when turning, and no increase in evaporative gas. The sound of the eruption was reduced. (3) The distance between the fuel pump and the jet pump outlet can be reduced, and the size of the pump unit can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a fuel tank and a fuel system of a vehicle, showing one embodiment of the present invention.

FIG. 2 is a perspective view of a device for returning excess fuel to a fuel tank according to another embodiment of the present invention.

FIG. 3 is a sectional view of a fuel tank and a fuel system of a conventional automobile.

FIG. 4 is a cross-sectional view of another conventional vehicle fuel tank and fuel system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fuel tank 2 Chamber 3 Filter 4 Fuel pump 9 Jet pump 9b Jet-jet spout 20 Protector 21 Bracket 22 Protector 23 Set screw

Continuation of the front page (56) References Japanese Utility Model Hei 1-81324 (JP, U) Japanese Utility Model Hei 1-76554 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F02M 37 / 00 331 F02M 37/20

Claims (3)

(57) [Scope of request for utility model registration] A pump for sucking fuel through a filter disposed at the bottom of the fuel tank is provided inside the fuel tank,
In a return device for returning excess fuel supplied to the engine by the pump to a tank through a return pipe, the return port of the return pipe is opened at a position close to a filter arranged on the suction side of the pump. There, and the feature that between the facing and the reflux port and the filter, consisting of a flat plate-shaped protector that return fuel is ejected from the recirculation opening is prevented from abutting directly filter comprises opposed to the above recirculation opening Surplus fuel return device to the fuel tank. 2. The surplus fuel tank according to claim 1, wherein the protector is formed of a metal or resin plate, and is disposed in the tank via a pump mounting member. Fuel return device. 3. The surplus fuel return device for a fuel tank according to claim 1, wherein the protector is formed of a metal or resin plate, and is attached to an opposite surface of the filter.